For the US group interscalene block will be performed in a method using ultrasound guided needle insertion. Following application of routine monitors, supplemental oxygen via facemask, and intravenous sedation, the skin overlying the brachial plexus will be anesthetized. A sterile cover will be used for the ultrasound probe. Using this probe, the anesthesiologist can visualize the nerve and will maneuver the tip of the needle into the nerve guided by the of ultrasound probe. Forty (40) milliliters of 0.5% Bupivicaine with 1.5% Mepivicaine with 1:200,00 of Epinephrine will be injected incrementally with intermittent aspiration. This block is chosen for the study because of its widespread use for a variety of shoulder procedures and for its low incidence of complications. The quoted success rate in the literature for interscalene block ranges for 70 to 95 percent.